High beam switch?

[Maker Scream]

I have an electrical problem that i'm not able to figure out. Any help would be greatly appreciated. I just got through replacing the headlight switch. Replacing that beast cured alot of problems i'd been having but one problem remains and i am STUMPED. My driver side headlight is very dim, while my passenger side is very bright, possible even in high beam mode. I know what you're thinking "so what happens when you step on the high beam switch"? ... Both headlights go out! Since the replacing headlight switch cured so many problems, my first thought is that maybe the high beam switch is bad. I ran out of daylight today so i'm going back at it again tomorrow & i need a few good ideas on where my troubleshooting should begin. Anybody able to point me in the right direction? ... and by the way, i'm very new at this so talk to me like i'm an idiot, it'll probaby help